Power-jack



W..I DAYTON AND L M. SCOTT.

POWER JACK.

V APPLICATION FILED SEPT. 9'. I9I8. 1,319,212. Patented oet. 21,1919

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W. L. DAYTON AND J. NI. SCOTT.

POWER JACK. APPLICATION FILED SEPT. 9. 1918. 1,319,212. Patented 011-. 21, 19111.

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UNITED sTATEs APATENT oEEIcE.

WILLIAM L. DAYToN AND JoHN M. scoTT, oF roar WORTH, TEXAS.

POWER-J ACK.

Application :tiled September 9, 1918. Seriall No. 253,159.

To all 'whom z't may concern:

Be it known that we, WILLIAM L. DAY- TON and JOHN M. SCOTT, both citizens of the United States of America, residing at Fort Worth, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Power-Jacks, of which the following is a specification.

Our invention relates to balancing jacks for air compressors, pumps, wellA drilling machines and the like, and the object is to provide a power mechanism for balancing the load or work at all points of the stroke in order that the driving mechanism or power for actuating the jack may all be utilized in actual driving and not be wasted in carrying a load during the driving operations. Another object is-to provide a power mechanismwhich is adaptable for driving y different machines in which there is reciprocating motion of the actuating mechanism. Another object is to provide a movable fulcrum by which the power is shifted during operations for the purpose of effecting a balancing of the load. Other objects and advantages will be fully explained in thev following description and the invention will be more particularly pointed out in the claims.

Reference is had to the accompanying drawings which form a part of this application. v

Figure 1 is a side elevation of one form of the balancing jack. Fig. 2 is a plan view of the same. Fig. 3 is a side elevation of another form of the jack, being a variation of the jack shown in the previous views. Fig. 4 is a plan view of the -jack shown in Fig. 3. Fig. 5 is a detail view, showing a variation in the crank-shaft for the jacks shown in Figs. 3 and 4. Fig. 6 is a broken view, showing a variation in the movable fulcrum.

Similar characters of reference are used to indicate the same parts throughout the several views.

The machine shown in Figs. 1 and 2 has an upright frame in two parts 1 and 2 and a triangular frame composed of parts 3 and 4 and` the parts 1 and 4 may be made integral. The members 1 and 2 are connected by cross bars 45 and 6 and across bar 7 connects both frames together. The frame members 3 and 4 are further connected by cross bars 8 and 9. The frame members 3 and 4 are further connected by a pivot or fulcrum bolt 10. The frame members 1 and 2 are further connect/ed bythe cross-shafts hereinafter described.

The machine is provided with a power Shaft 11 which is journaled 'in frame members 1 and 2 and a power wheel 12 is rigid with shaft 11 and a pinion 13 is rigid with ashaft 11. The pinion 13meshes with and drives spur gear wheels 14 and 15 which are rigid with shafts 16 and 17 respectively. The shafts 16 and 17 are journaled in the frame members 1 and 2.y The wheel 14 meshes with and drives the spur gear wheel 18 which is rigid with shaft 19 Which is journaled in frame members 1 and 2. A balance wheel 2O is rigid with shaftll.

A walking beam 21 is mounted on a movable fulcrum 22 which is carried by a bracket 23.' The bracket 23 is carried by an arm 24 which is pivoted on the fulcrum bolt 10. The Walking beam 21 is provided with a brace consisting of rods 25 and 26 connected thereto and to each other by a turnbuckle 27. A working orv connecting bar or rod 28 is pivotally connected to the bracket 29 which is rigid with th'e walking beam.

The fulcrum arm 24 is actuated by a link bar 30 which is pivotally connected thereto and pivotally connected to a crank 31 which is rigid with shaft 19, the shaft 19 being driven by the wheel 18. Synchronously with the movement of the ful'crum 22, the walking beam 2 1" is actuated by the link bar 32 which is pivotallyrconnected to the walking beam 21 and -pivotally connected to a crank 33 which is rigid with shaft 17, the shaft 17 being driven by the gear wheel 15. The cranks 31 and 33 move inunison, the crank 33 actuating the walking beam 21 and the crank 31 shifting the fulcrum 22 as required for balancing purposes. Incidentally the stroke of the power end 34 of the walking beam is much increased by the connections set forth. The shifting ofthe fulcrum 22 systematically removes a resistance which Patented Oct. 21, 1919.

is ordinarily encountered in the operation of walking beam which has a non-shifting fulcrum and the removal of this resistance leaves more of lthe power of the driving mechanism free to act on the'load or work to be. done.

In the form tof the devices shown in Figs. v3 to 5 inclusive, the two frames are combined into a single frame and the triangular members 35 and 36 are integral respectively with the rectangular frame members 37 and 38.. The driving gear is the same in all respects except the two power transmitting shafts are changed to crank shafts 39 and 40. rIhe only other change Ais in the fulcrum carrying arm. A fulcrum carrying lever 41 and the link bar 30 is pivotally connected to the lever 41 and the fulcrum 22 is shifted to the opposite side of the fulcrum bolt 10. The pivotal connection of the link bars 30 and 32 with the walking beam and with the moving cranks permit the shifting of the walking beam. The machine is thus provided with a fulcrum shifting link bar and with a walking beam actuating link bar or pitman. One feature to be noted in the machines above set forth is that the crank 33 is approximately twice the length of the crank 31.

By reason of the provision of a movable fulcrum for the Walking beam, a new function is effected whereby the load or work is mechanically thrown on the .transmission gear by means of the crank 24 and the fulcrum and the crank are both moving downwardly at the same time, being forced down by the load or work, and as the transmission gear wheel is turning in the same direction as the crank, the driving gear is positively aided by the work or load.

This variation shows the link bar 30 pivotally connected to a movable standard or shank 42 which moves through the frame member 43 and which is pivotally connected4 to the fulcrum 22.

What we claim, is-

l. A power jack comprising a walking beam, a movable fulcrum therefor, means for actuating said walking beam, and means for simultaneously moving said fulcrum.

2. A power jack comprising a walking beam, a movable fulcrum therefor, a driving gear, means operatively connecting said v driving gear to said walking beam for actu# ating the same,- and means operatively connecting said driving gear -to said movable fulcrum for shifting said movable fulcrum.

3. A power jack comprising a walking beam, a movable fulcrum therefor, a driving gear, a transmission gear wheel operatively connected to said driving gear and to said walking beam for actuating the walking beam, and a transmission gear wheel operatively connected to said driving gear and to said movable fulcrum whereby the force of the work or load is utilized to aid said driving gear. l

4. A power jack comprising a frame, a fulcrum arm pivoted on said frame, driving gear mounted on said frame, a walking beam fulcrumed on the free end of said fulcrum arm, a transmission gear wheel operatively connected to said driving gear and'to said walking beam, and a transmission gear wheel operatively connected-to said drivmg gear and to the free end of said fulcrum arm.

5. A power jack comprising a frame, a fulcrum arm pivoted on said frame, driving gear mounted on said frame, a walking beam fulcrumed on the free end of said arm, a transmission gear wheel connected to said driving gear, a crank rigid with said transmission wheel, a link bar pivotally connected to said crank and to said walking beam, a transmission gear wheel connected to said driving gear, and a link bar pivotally connected to said last mentioned transmission gear wheel and to the free end of said fulcrum arm.

6. A power jack comprising a walking beam, a movable fulcrum therefor, driving gear for actuating said walking beam, and means actuated by said driving gear for moving said fulcrum and for receiving and transmitting the force of the load or work to said driving gear.

7 A power jack'comprisin a walking beam, a movable fulcrum therefor, a driving gear for actuating said walking beam, and means for transmitting the force of thelo'ad or work from said walking beam to said driving gear consisting of gearing operatively connected to said driving gear and a link bar operatively connected to said movl 

